I've got an AONE4 RTW itinerany ex DOH priced up at QAR88,000 (approx £7500 or US$12000) is this a good price?

Also do I just buy it online or do I try to get AA to ticket it which I've read saves taxes or will this not apply in the this case? I'm still in the planning stages but wanted to know the best place to start from, way to go about booking it etc.